公开(公告)号：US20230396240A1

公开(公告)日：2023-12-07

申请号：US17831013

申请日：2022-06-02

Applicant: Advanced Micro Devices, Inc.

Inventor： Thomas H. Likens ,  Gerald R. Talbot

IPC: H03K3/03 ,  G06F1/06

CPC classification number: H03K3/0322 ,  G06F1/06

Abstract: A three-stage differential ring oscillator circuit has a first differential stage, a second differential stage, and a third differential stage and generates six phases (two in each stage) used to form differential in-phase and quadrature-phase clock signals. A cross coupled inverter pair couples the first stage output signals. A second cross coupled inverter pair couples the second stage output signals. A third cross coupled inverter pair couples the third stage output signals. A first interpolator generates a first quadrature-phase clock signal using two phases (one from the positive portion of the second stage and one from the negative portion of the third stage) and a second interpolator generates a second quadrature-phase clock signal using two phases (one from the negative portion of the second stage and one from the positive portion of the third stage). Two phases from the first differential stage form the differential pair of in-phase clock signals.